Questions from students, looking for advice for their homework.

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1
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2answers
19 views

Single formula to search column and return corresponding fields

Am having issues creating a single formula to search the billionaires list by name and autofill the rank, age, net worth, and citizenship field in the search spreadsheet. This is the formula I have ...
1
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2answers
63 views

Monitoring Excessive User Home Directory Growth

I am trying to write a script for a school assignment that will check and see if any of the non-administrative user home directories have increased in size by more than 100 MB in a single 20 minute ...
1
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0answers
51 views

How to determine control/data/address bus width

I am hoping you guys can help. I need to know how to calculate the control bus, address bus, and data bus width of a hypothetical CPU. A computer is word addressable with a 64 bit word size and ...
0
votes
1answer
50 views

If you have a T3 dedicated line do you need a VPN?

Is this redundant or can you run VPN on a T3 dedicated line? Do you still need security protection on the T3 line? I was going to put VPN on my T3 line in my project, but after reading it through it ...
2
votes
3answers
430 views

Which memory is accessed by the initialization code on a PC?

CMOS, DRAM, ROM and EPROM are all types of memory found in PC systems. Explain which of these is used to contain the initialisation code and which are accessed by this code. The first answer ...
1
vote
0answers
51 views

Calculate bandwidth for a crossbar system

Not quite sure which StackExchange community this question would fit it. I had an midterm last week where I had a question I still don't quite understand, and I hope to get some help here. So the ...
0
votes
1answer
29 views

byte addressing and cache

http://6004.mit.edu/currentsemester/tutprobs/caches_answers.html Given DM: a direct-mapped cache. S2: a 2-way set-associative cache with a least-recently-used replacement policy. FA: a ...
0
votes
0answers
33 views

Fragmentation of packets in virtual circuits

Is it possible for packets passing through a virtual circuit to become fragmented? If so, how and why?
2
votes
1answer
473 views

How many subnets are needed?

I'm just starting out with networks. I'm trying to determine how many subnets are needed for this network: BRANCH1, BRANCH2 and HQ are routers. The Boxes between routers and PCs are switches. The ...
0
votes
1answer
438 views

How to calculate the size of the page table from this data?

A computer uses 46–bit virtual address, 32–bit physical address, and a three–level page table organization. The page table base register stores the base address of the first–level table, which ...
0
votes
1answer
62 views

On executing ls bar you see a list of 10 files of which bar is one of them. How can that happen? [closed]

I came across this question in an exercise in a UNIX textbook and can't seem to figure it out
0
votes
0answers
62 views

Cache set-associative and memory address

I've to project a cpu cache using verilog. The cache has to be a two way associative cache, with 128 sets and blocks are 8 bytes long. So, I'll have: 31 10|9 3|2 ...
0
votes
1answer
367 views

What PowerShell command would you use to create a Hyper-V virtual machine?

‍23. What PowerShell command would you use to create a Hyper-V virtual machine? New-VM -Name "VM Name" -MemoryStartupBytes <memory> -NewVHDSizeBytes <disk size> New-VM -Name "VM Name" ...
0
votes
1answer
118 views

How do I get email from users in PHP and send mail For them?

I am new in PHP. I write code in Dreamweaver Software and I tested them with XAMPP control panel. I want to write a program for send a newsletter to many emails. Namely, 1-Take email 2-sending ...
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votes
3answers
269 views

Unix MULTIPLE Choice

In Unix, when 2 programs have the same name: The one that is found earliest will be executed The system program will be executed over the user program The user program will be executed over the ...
2
votes
1answer
170 views

Which codec should I choose to work with in a VoIP project? [closed]

I would like to work with a codec in a project for the university. I'm interested in the VoIP telephone service. The idea is to implement the codec in a DSP and then characterize it. My question is ...
0
votes
2answers
470 views

What is the difference between link speed and propagation speed of a network link?

In one assignment, the direct link transmission rate is given as 20 Mbps and the propagation speed over the link is 25x 10^7 meter/sec. This link connects host A to B. How is there a difference ...
0
votes
1answer
346 views

openSSL tutorial not fully working - Can sign but cannot restore original file

I'm writing, and testing, a little tutorial for my groupmates involved in an openSSL homework. We have a bunch of PDF files, I'm the CA and each one should send me a signed PDF for me to be verified. ...
1
vote
3answers
464 views

Batch file - How to update folder search path for batch script file execution?

The question on the homework sheet is: Update the folder search path for batch script file execution to include the "Processing" subfolder, and then display the folder search path. (Make sure you ...
1
vote
2answers
80 views

How clocks get synchronized? [closed]

In a syschronus communication between two DTEs, the frames sent are composed of an initial burst of bits (0s and 1s) to force the reciever DTE to synchronize its clock. Is it possible that the ...
1
vote
2answers
1k views

How do I specify a line of text in a text file for a batch file

I am wondering if I can tell the computer to do a command on a text file with a batch file, however i would like to specify whitch line to modify. I do not have any code for this yet and I would be ...
1
vote
1answer
511 views

Where can I find information on group policy compatibility between Windows OS versions?

I am having trouble trying to find information on group policies compatibility between different versions of Windows. I have to find this information for a school assignment I need to complete. Does ...
0
votes
1answer
232 views

per-host-pair cryptographic keys on a network

Got a homework question here that I have been staring at for a while. I am being asked how many keys will exist in a network of 'n' number of nodes with keys being distributed on a per-host-pair ...
2
votes
5answers
8k views

Why does 1KB contain 1024 bytes when 1KB = 1000 bytes? [closed]

Why does 1KB equal 1024 bytes? I know that 1KB also stores 1000 bytes. That is, I've been told that 1Kb equals 1024 bytes, but my professor says that it's 1000 bytes and that Linux doesn't use the ...
2
votes
2answers
2k views

Difference between the Windows and Linux thread scheduler

As far as I can tell, both use: Multilevel feedback queue Priority levels (different range) Both manage threads and not the process But what are the big differences? Thanks
-2
votes
1answer
2k views

Explain the behavior of the following shell script [closed]

Explain the behavior of the following shell script: $ cat quote_demo twoliner="This is line 1. This is line 2." echo "$twoliner" echo $twoliner How many arguments does each echo command see in ...
1
vote
1answer
970 views

virtualbox virtual machine on usb flash drive

In my Linux class, we created virtual machines on flash drives, and installed Lubuntu on them. We are supposed to be able to now run our virtual machines on any computer with oracle vm installed, at ...
0
votes
1answer
74 views

How to Make Linux Partition Boootable?

I need a help, Ive ended up on my Linux machine without a bootable drive, I need to make one of my Drives bootable? Any Ideas
-1
votes
1answer
779 views

RAM requirements 0.5 second frame buffer - video card 30fps, screen res of 1280x1024, color depth of 4-36 Bits? [closed]

How much RAM is required for a 0.5 second frame buffer on a video card that is displaying 30fps, has a screen resolution of 1280x1024, and uses a color depth of 4-36 Bits? As a programming student I ...
1
vote
1answer
117 views

Delete newlines using Stream editor (sed)

I need to write a sed script that places the actual text of the subtitles in a srt file on a single line. If this text originally was split over multiple lines, the line break and possible ...
0
votes
2answers
5k views

How to change the text color by a function in Excel 2010

How does one achieve the following: If (the value of cell A1) < (than the value 0) then (all the text representing the number in cell A1) should be the color (RED)?
1
vote
1answer
135 views

Token Ring - is a MAU required?

I'm writing a paper for school on Token Ring, but I'm having trouble discerning something. From what I understand, there are two types of Token Ring networks: wired, and star-wired. I understand ...
1
vote
1answer
143 views

Subnetting - how to?

I can't cope with this MS 70-291 Training Kit Task: What is the configuration error in the diagram below and WHY? (btw: I have removed original, wrong mask which was editors error and placed big red ...
0
votes
1answer
168 views

How to write a script that does what less does?

Question: Create a script such that it is a command that has the same effect as the "less" command (implement the script by calling "less"). What I wrote: #! /bin/bash for index in "$@" do less ...
1
vote
2answers
489 views

working with graphic interface on ssh linux

We have a project involving linux programming. Unfortunalty, we have only an ssh interface, and not a convinient graphic one. What can we do? We heard that xterm can solve our problems, but we ...
3
votes
1answer
140 views

Configuring subnets quandry

I am learning the basics of subnetting however am faced with a dilemma on approaching the issue. For example I have been tasked to set up a network with 20 hosts using a Class C network addressing ...
0
votes
1answer
390 views

Adding percent value in cell to a dollar amount in Excel

I have a column of currency formatted cells (C8:C15) and a markup rate of 15% which is entered into B19. I want to have the markup rate applied to C8:C15. Starting with C8 I entered the formula =B8 + ...
1
vote
1answer
1k views

Can I temporarily affect ARP table without using `arp` command directly?

I have some knowledge about arp command under linux which can help modify the ARP table. Now I want to temporarily affect ARP table(add, delete and change) entries without the help of arp. For ...
0
votes
1answer
438 views

Find duplicate file use cmp command

I would to write a bash script to find duplicate files but I don't want just use md5sum. It means, in addition to use md5sum I want to check my files with cmp command. I use the command below for ...
1
vote
1answer
1k views

What is the purpose of a routing protocol? [closed]

I'm studying for CCNA 2 exam. Here's one of the questions. I already know the answer. What I am looking for is the reason why the incorrect answers are...incorrect. =) For example, the question is: ...
0
votes
3answers
858 views

Can't seem to change directory - “No such file or directory” error using PuTTY

I am required to use PuTTY to submit a program but I have never used it before and am having a hard time changing my directory. I am successfully connected to a Linux computer from my own but can't ...
2
votes
1answer
230 views

What privilege is required to preserve ownership of a file on copy, and how do you get it?

I have a homework question about kernel programming in Linux. The question is: What Linux-specific privilege is required to preserve ownership of a file when it's copied, and how do you get it? ...
0
votes
2answers
760 views

subnet mask creater

Create a sub net mask for 512 subnets using 172.31.0.0 The default sub net mask for a class b network is 255.255.0.0, working through the borrowing off bits using the formula 2^n, n being the bits ...
0
votes
1answer
370 views

Mask a class D IP address

Last time I asked about masking class D ip addresses. I found that we cannot mask class D IP addresses. But, now I have another question about masking D class IP addresses: If I want to recieve a ...
2
votes
3answers
3k views

Class D ip address

Is there mask for class D ip address? As it is for multicast, I am not sure about it. I read somewhere that D ip addressas are 32-bit network addresses and they dont have hostID, but in the following ...
0
votes
1answer
2k views

How do I calculate how long a packet will reach its destination?

I am stuck with this homework question. I honestly have no clue what it is talking about. The question asked: You are transmitting 100 bit packets over a long distance link of 40 km. I assume ...
1
vote
2answers
165 views

Is it possible to execute a new application if the CPU Utilization of a computer is 100%?

The CPU Utilization of a computer is 100%. Is it possible to execute a new application under the above condition?
0
votes
3answers
8k views

what is a core in terms of a processor? [duplicate]

Possible Duplicate: Can someone clear up the terms Core Duo CPU, Quad Core, Dual CPU, etc.? In a processor, what is the core? I hear the terms i3, Core 2 Duo, and Dual Core, what do they ...
0
votes
1answer
223 views

MS Excel pivot table

I have an Excel file: payroll.xlsx I need to do the following, but I'm not sure how: Create a pivot table that computes per employee how many times s/he checked in and her/his average amount ...
4
votes
4answers
599 views

how to create a file and delete a file using “-” symbol

How would you create and then delete a file that begins with the symbol "-"? Try it. I can't write the command for this question and I don't why. Can anyone help me?